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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ac0b7d24902bfb51e68e40694867c7dff11e762a7ac2a21b5aaaa6c58039a2' 
  AND token = 'FAqEcHNNCDOA4UJg2b4jAFPTNeESZa+UeObGibjVSeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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