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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317f2953039dedd8bfddcf5606b0f8262d9dd2b9c0a37e24fa3b7f04d4c38ec5' 
  AND token = '5S8O8KcddT2i5kIJPSgHoVNdDVS4YfoFTy74w0tRlYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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