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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d8b7eca03bf7e46a6d581bd7393de832a319e78f7e4671dbea9c28383d4cd6' 
  AND token = 'GB8emvtJFtxh3WH0mHMYHoR0YcLFEPeotqHK1y+WMAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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