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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256d61c8275d1ff2561815a2f0846aa924c796ad5c6fc64220dfd5cc01ab788b' 
  AND token = '5vWV3pw+2leEQEIXtaYL+DYylTI+EeEE94X+zi4jYmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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