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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abfca53654d06475e5d10c9bd97897bfb57028c16c07332389b64e62b8e26fe' 
  AND token = '2Pdp8hs4w5o94ZR9W/G7jTAVa2ARS3To7I9DyklY8Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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