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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f516e03562282262e837250d24f2cc45d85863e666ce65d008851d2526143f' 
  AND token = 'cSMdSRB2/Ofr0YYIAlJb/LmSUqAMux4sptRTeVDbvQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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