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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f671250d420622cce2c0abd277a996f4e1707ddad1b41cd1092e68ef8983ebb' 
  AND token = '2ZHxBikWose3ogdvfjerN/fSRkd4O4mTseKQkR3gh14=' 
  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"
    }
  }
}