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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8b2bf034918f9e0b3b2865c8325a2773fb82ebf7eac1f2e3e0ca3f113f1ce5' 
  AND token = 'Xp83gMIor+NlYKHlqzFjNUEdNDhgfmZYZO6psHzNjjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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