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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb26660cee4d9506f7d009818af263eb005e3e841e4eff43856923d64bc112a' 
  AND token = 'tUHmd6X8Tnfj/su3SmuxoCsrH/S72VUqckAo62NDGjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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