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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413d604a3c2a70496a260e4dff1d5acc7bea2e3d7b6281e326334f57a6f1a4c6' 
  AND token = 'IwmAk1M1xFToanXY8mID0z+eUAAsi6zRtVy0umIxjTs=' 
  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"
    }
  }
}