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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c31907afbc069f4bf9225087c86439e9dd3843b2529cb2b3993e0894d04ca8' 
  AND token = 'v1l9bxMwHx3/OeNTk1iCzFm2Lm4YQA0Pytbk/oyV2V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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