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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d26c889fed8176c4a3a283d9b54d821af826cfbd5df01ba27a4cc7995fe7f7' 
  AND token = 'O+1mwEH5N2i6COj+7edP0OENsPOLj7nYbP1Z7ZASk+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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