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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bb96136939844ebe2ff576bca51a1a0f9ace5b23990e26bfb99d52189f4798' 
  AND token = '6H0UQHmin2XnwoxfKGj1TXmmKxG58Epy8ddd4e889m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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