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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643f64a24d77e8abf4dfdea28f4d80798998abc7699910e6cc106b51458670dc' 
  AND token = 'XiN0CkABLKDgba/LzLuGJWWD1aq3bV4J8Q22q1dPsys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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