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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1b2b77374c4b9f7fb7cf5be0b3c8e60c131755be65925298c01fc744ebeb06' 
  AND token = 'Mmks9styExHR3M/Pp2Cz34JjRQ+1+IO7mPXa5SMvutg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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