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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fa7551950c762a8d027ebaae76ce2a4b6021833a38e194ad2f68e4eb11f4f5' 
  AND token = 'rF+QIeeDf3I5myZkB0l3X9OAEBeUdPzhqQnKapWsG6Q=' 
  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"
    }
  }
}