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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3fd9127c4fb09ff7a6ceecc96a21def727a3e36e9c3998daeed61eb87dbb7a' 
  AND token = 'EqFF9uZhl4eR1d2Yq5IzjA8t3wtfUM8Z7QJ7cNXn1GQ=' 
  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"
    }
  }
}