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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0657b3a4daf1e1ac4bb3d2c28e8784ec2d677773ae59bba0faa14e86263e4972' 
  AND token = 'KCK7Nw8X6dlplj7Cc8P4iFWdv/hx1zGe/19bg+ufYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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