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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317f3db1577343271fbc60713a15994217e99d1a5570541b8dbc165f2def5cc6' 
  AND token = '1D4WWg1jP01Em9pmpIvBPu1qR2UmAAcrsdSPrjyJTUs=' 
  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"
    }
  }
}