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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc551758a5bd3cd01e6e4487fbab44846e5ad8d78b38b6da673efb16331ddb0' 
  AND token = 'QAu2uyBBJmoej42/lI9Wx8SMDyaw619lmCx/YFBr7j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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