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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d47afa65994fd515f5a063f165b5e84134b165687a51892d9d0a1cc812d1e0' 
  AND token = '2Rm+i+vdfte3l1/I1whGjjDXcq3N8r/2SoZSbRLbzQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}