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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa847d580eec9d7c40258dbfe01e7e10926cafe2cd85294d60288e67c86b2d7' 
  AND token = 'ujP6s9tiN03oh9FwFdCL+IahvPFsH3g+G4bAp1PEqIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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