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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab42235d725e0b0c80a828a031e7e42c4619e6bda02d880a5dcdff3a3f84ed0' 
  AND token = 'nJ0a+B/sBedS+UavV3Hr9yUj1aOfwlMWwJHagAI5h2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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