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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f4c1bf98b7da1cf60337405a86eccc1b2a4e6cc0c2be509255178be7701abc' 
  AND token = '8YLkA5hpzvrIk+LAA7CjFE+4G61R3XDFQ6LVww57/yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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