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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051c24e8ac726893e6ae188d13531c8f038d67da0e762db00526bfe9a34fd229' 
  AND token = 'Ddek2d8F71NsroDawfOQQ5VTbbkZkpnL1bXCqNgW1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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