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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a166b638b49dca71fa40be5db09b6ae39a8c976f13828e8d1998ee79fc80c7a7' 
  AND token = 'j9gdSVIrejXHEJNc60vCUxsc4uWrkDg+jG1txHB+50Q=' 
  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"
    }
  }
}