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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101c32ccb8f8f0c3a584d036facec584eda5ec40275051389d9a7e799200069b' 
  AND token = 'va1X6pQtEFXutJNtM+e8ZTixlPit8KDqgsqTe0ZoqyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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