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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ef772384779fbeefb9cfdd80ccc2a9fedff3d6d05aac6d78c770244d373a14' 
  AND token = 'JKDt0pW6EToz5CVsFej5cOb+1k0JgDx4BxcVO9yD5lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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