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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0f67b65b0fe38ba0a9f4333577d6143b9c32b2eb71b9f99b062f07edfe85a2' 
  AND token = 'YY0bpcVPHsrFIyoH1/QkHA4W+38W29np/JYZEhNj82g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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