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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aebef387ffbc4d03bfc7c8b741ad60452757b571bccd15e1dd67f08c34fff7c' 
  AND token = 'H6dH+x7GW0fza8SQxsbgzLZ/thN9GEqeydXBCS7PHCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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