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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46769fe76e50b56d7deada85c67d2d55dd5b8862c121312d105b9d12731e815' 
  AND token = 'fXVN+3TnIHlkXea2gNMI550G3NoRWu4tgfEaR/THr+E=' 
  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"
    }
  }
}