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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc32ee23d388c67e02c8c3b0067e43ac436d85cc6ab20af769ad4ca4d682e3c' 
  AND token = 'OeeevkBcuJ4h+KiudVJTr66u8Wqot7ZxdT8s9pmqO8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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