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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39c17fbc46575bac6d87e66d341778c269a282db8d1d4674177ac8b7b29159a' 
  AND token = '8cnruQz1YTGori2+mEmLWNpBFci9xLyCGwtN59r1bLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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