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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e13b8b8f6b661ddf3b386852b9e45d3c5c31ca8cab5955fe8b535b798e7d25' 
  AND token = 'IIXDm6v1CABLP7KzaKsfNPDKrlRxmoWY5u+lbjcRLBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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