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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7806bba2149c53e652e7cd7d9335a8e575f3480eca6a0717f1058f731b80a2ce' 
  AND token = '5O6pCn3xOhoWe+wcNFEbYzLvRCHYSDtyQG+r7y4y/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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