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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b554b908bd24e38cb58663d4633ea47c99f82191f713aa34593cb136ac50bc39' 
  AND token = 'tIuNOmcNXTpqy6wxKjwVvCKYeO4txrIJO5lBF98s8PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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