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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12b5717c9b2396b6efd3dccfa9bdf53f5eed93b09e641ba821a5100bb9690b0' 
  AND token = '3QlIciPJg4ZpTEVcPylRZ72sZIm/yyZJh9XYGzm+qNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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