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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d33951e23ba81999692ad309c60aef9ffd36c72c10cb06e0552d7cc928b02d' 
  AND token = 'Z0UN6DCD5H58tS5dQtLq+O1aBcWfK9BYZUd4EjS4ixk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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