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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0efa021322db72cb1ebeaaa1903f48bf92c83b3435be41de234dc17a9591714' 
  AND token = 'IA/cobqmiSrKfII+9cW+KGN18El/+vQEkI6XpYw0F1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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