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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d511d88962b479ec6b0cc229b766add704a65efe61db1745c81f2e4d504475' 
  AND token = 'yOFFnmuhXPd7bi4i03kJ1Tvwm+eoz/F1M4qVyfisLd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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