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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e9c924015a44bc54ff8a5cce57f963a7f0ce43097cf8183fcc61f60c977076' 
  AND token = '9burJQsEhgf6FaFiGYY9YV7E2h/Tq9FFiuzRtB4OMEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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