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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f898566f380e470b43263b4afd157373133c4ed6ff9d02c0b7e92bdcf87d09' 
  AND token = 'Gk/9cjdxSyQdmQmMH/5FOI7tSu/UNLTT6SVR4Ug5a2o=' 
  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"
    }
  }
}