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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb81a6ca2b670933c14ef231ccf9ba82caa65b7aaf95e872f8a920e5e545d23' 
  AND token = 'tF9xB2d1qXbBSJarDtz1asp7Pu+2dFek6H6jzkvvaaE=' 
  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"
    }
  }
}