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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c605f9c1478feb3b0b8a791d416c2eb4137f3f8636ba1aa90903c1063840b343' 
  AND token = 'KDVbuzLYxn5rt6oDWxNjkQZDvFh4SSofelZotbxgS1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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