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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cde2b7010252dc0859b85cdfe592c32c7d88f2326f23fd1dc2f2b233c4a616' 
  AND token = 'jo7dZ0Aea4u8p9zm9MFIVWKGPZdsCj5rowzSouFmHH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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