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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ad1ed2c7909e30ccda6b17f69ca650b3bda4fa8c8c4c1d3f8e7d175e59053b' 
  AND token = '6vLhK8zyozQAe6twXltf9NQ41JwYrMqApwC7/wTh5PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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