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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8430344314eccfe3d2bcf1a8b791acf185ef281ef01d37143b930114d865f062' 
  AND token = 'uC3szNh8S69T3/pp5KUH5uXOHCdC12uPUL3I2932n8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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