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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4285ed2c79910349767bbff3221847855bf650b8c397c940c427b40ab5af8e' 
  AND token = 'JXheTkI5c1mu63+aKjJIR1q4oPTOPvVHQ5ah18jmq98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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