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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6036c1166b8c9fa2846c98965a7f5a3f29aebf3c86a4d5b7341652e2c322235' 
  AND token = 'nnlhMUsYirLWsd3kwaRv08IqnCWSv1Na0e3MHs88MGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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