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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503339f956e0722bd95bcb77e436033ae7164dc0e8689e7c8cb85280cc8c34b8' 
  AND token = 'DKut1GNxNpNoX9ShgPPY2SVcEs6oMoP37VCU87U90/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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