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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c01e646197865cdb3a8cb2e69aef9c680c31d97473d063ae0275bed851e37fe' 
  AND token = 'zX4GGj5Eo0jubr24F4/FLLy+qUn85An5BEti7w1aTJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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