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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06e51802fa03e800918313fbd296c9829464d583e6bf76dfcaa6d67f24009a1' 
  AND token = 'uPQ10O+AsUL4NczPekLVFIypzu8jqlKfwTfGprxGTaI=' 
  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"
    }
  }
}