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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f1d5c764f813a4c1b42311748995a081e3d77d32b664bf25f685144d26ebdb' 
  AND token = 'HZ710qTKd7H4Sfd1KWlbF1+oLDFJxN33uegKmPZHLVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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