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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f1dfd10c6bea14ec3dddbe148f16ff06869c2f06984cbcede463b4855d45a5' 
  AND token = 'pnEPu22xHsd4cG5lXhY2uA1YfpNN740EgtXq+3/Hw9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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